M 22 "rock crusher" Jump to Latest There is no way to tell which Muncie you have by the "throw lengths" You are talking about the short or long throw shifter A LOT of people think a "close ratio" trans has that short throw shifter or a wide ratio Muncie has that long throw TWO entirely different things
Levon Hovagimian Team Chevelle #279 2015 Camaro ZL1 SOLD 70 Chevelle SS 454 LS5 4 speed SOLD 1966 427 Corvette SOLD 1973 Camaro IHRA Hot Rod LS 6 Auto 121 Chased a or better SOLD
The 1 ratio first gear is usually referred to as the Muncie M21 transmission; based on GM s production codes The 1 ratio is referred to as the M20 Muncie also had a second close ratio transmission coded M22 and known as the rock crusher which was used behind performance big block engines and in some Corvettes These M22
The original post said "without pulling it from the vehicle" Thus the request for any/all numbers on the trans to Help identify it After 35 yrs anything could have happened to these tranys The numbers would help determine what it was or not it is still original is anyones guess
Also there s companies out there that are making new gear set s for Muncie s as just stock replacement stuff either You can outfit an M20 or M21 with Rock Crusher type gears OR actually make a 3 speed O/D out of a 4 speed case Forth being the overdrive Kinda nice if you want the Muncie look and an
C3 General M22 Rock Crusher Just bought a 1968 originally was 427/ has a CE replacement block from 69 and I believe it has a M22 vice M21 Intent at some point in the near future is to crawl under and check numbers/code I know it has the factory 411 rear end Code FB so that is the first
The trans and driveshaft are back in Probably will be the last time I put in a transmission by myself unless I get a lift some day No better sound than a Muncie clunking into place in the bellhousing Just need to button up the shifter brake cable and carpeting and I can go for a spin to see if I got the right gear in there
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The main housing has the following numbers On the right side 3925660 US PATENT NO 3088330 On the right side of the tail piece is 3857584 GM My book says it is a M 22 Rock Crusher with first gear and if it has Side Cover part # 3950306 it is a 69 and if it says 3884685 it is a 68 By gosh you re right again DZ This trans was
The transmission would make the same rock crusher noise but I would have a much tougher transmission 1966 Charger 383 727 Torqueflight 1970 SS 454 Chevelle LS5 2 M22 12 bolt
5 Muncie also had a second close ratio transmission coded M22 and known as the "rock crusher " which was used behind performance big block engines and in some Corvettes These M22 units are highly sought after for performance applications The term "rock crusher" refers to the noise made by the meshing of the strong er helical gears in the M22
If it was a replacement case it would be stamped CC0 for counter case but no "P" number because it never was assembled at Theres no telling when this trans was installed in your car or how long this trans sat in a I have a very large selection of CT9 4 cases and CC9 4 cases and a never install CT9 NOS M 21 complete
The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet s big blocks in the mid 1960s The early production Muncie four speed case is the small bore unit and can be identified by the GM casting number 3831704 see Muncie M20/M21/M22 Main Case Identification chart The large bore Muncie came into production in
1969 camaro x33 code z28 matching numbers see hd video click on link bottom left of listing fully restored finished in 2013 well over 65k spent on this real deal x33 code z28 camaro car retains its original rebuilt to factory specs numbers matching dz 302 motor the motor was decked when rebuilt but still retains its original partial vin stamp at oil boss there is a picture in
GM Muncie transmission rebuilt and guaranteed for 1 year Correct fit for all 1967 1968 model Chevelles and Novas This one will have the studs coming out from the side where your shifter linkage mounts This is the Muncie M 22 Rockcrusher four speed Designed for the highest performance models
There were also differing numbers of grooves cut into the input shaft on many Muncie presumably for quicker assembly line identification BUT unless a trans is an untouched original these parts are probably pretty likely to have been replaced over the past 30 40 years
The M20 is the wide ratio regular Muncie in 63 65 then 66 74 it was the M21 is the regular close ratio and the M22 is the Heavy Duty Rockcrusher 66 72 no documentation for a 73 74 M22 If just if you had a matching number 64 65 Chevelle or anything with a M20 21 amd wanted to convert to a really strong M22 it s
As I said earlier when I modify an original 68 72 Muncie handle to fit a Hurst shifter it is permanently ruined as far as ever being able to bolt back onto a FACTORY Muncie shifter The factory 68 72 Muncie handle has an angle on the lower end with 2 bolt holes to bolt it to the shifter I cut this angle off right at the bend
